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    <title>Document</title>
</head>
<body>
    <script src="./js/vue.js"></script>
    <div id='app'>
       <counter></counter>
       <counter></counter>
       <counter></counter>
    </div>
    
    <script>
        let app =new Vue({
             el:"#app",
             components:{//局部注册组件
                counter:{//组件名称
                    data:function(){//data属性必须对应一个函数，这样每一个组件可以维护一个被返回对象的独立拷贝，组件之间互不干扰
                        return {
                            num:0
                        }
                    },
                    template:'<button @click="num++">点击{{num}}次</button>'//将template属性指定的模板进行替换
                },
                
             }
        })
    </script>
</body>
</html>